Again this is from a thermal break / thermal bridging standpoint. Even more so, if a vertically seamed metal roof is being installed. This blocks conductive heat transfer and helps keep attics cooler during the summer.įinally, if a structure has very limited insulation and ventilation – especially ventilation in the attic – battens can be helpful. The dead air space in the hollow beneath these panels acts like the dead air space between two panels of glass in a thermal pane window. This creates a thermal break which is very similar to a vertically seamed metal roof installed on battens. These products usually have integral airspace or an insulated cavity between the metal and the roof deck. As a great option to the expense and bother of battens, there are concealed faster metal shingles, shakes, and tiles available. Those can be something many folks want to avoid. One thing to remember is that many of the products that are installed over battens have exposed fasteners. This means gutters will have to be rehung, and it also could interfere with skylights, clearstory windows, dormers, even chimneys, and plumbing stacks.Īgain if you have good attic ventilation and insulation, those things alone are very helpful and can be more than adequate for most homes. However, cross battening significantly raise the roof level. This has very positive results as far as keeping heat out of the attic, and it can also help avoid rooftop ice dams in the winter. The resulting vertically-oriented chambers can then be ventilated by bringing fresh air in at the bottom and exhausting it out at the top. This involves putting down vertical battens first, attaching them through the roof deck to the rafters, and then putting down horizontal battens for the roof panel attachment. One effective way to use battens is to cross batten. Your attic ventilation and insulation will also help with summer energy efficiency. However, if you choose a metal roof that is either light in color or has reflective pigment in the paint, that will also be very helpful. Now, as to the potential benefit of battens, they do create a thermal break to help minimize heat transfer from the metal to the roof deck. In that case, the old shingles should be removed, or battens could be installed over those old shingles. However, a true standing seam – especially one without any sort of striations or stiffening beads in the center of the panels – will probably show oil canning as the result of going over old shingles. You also could install a corrugated through-fastened metal roofing product and probably not have issues with that either. Now, if your home’s existing shingles are pretty curled, you could install a metal roof in the form of a metal shingle, shake or tile directly over those curled shingles along with underlayment. We normally suggest a layer of one of the higher quality synthetic underlayment and ice and water shield if required by code. We interpret the international building code as requiring this, and it’s just good practice. Next, we highly advise the use of a layer of underlayment over the old shingles or decking, whether or not battens are used. Installations over battens alone are just an invitation to condensation issues in the attic. Keep in mind for residential applications, we never suggest installations over battens unless there’s a solid deck beneath the battens. So first and foremost, it’s critical to choose the right product and install it according to the manufacturer’s specifications. By design, some metal roofs must be installed over battens, some must never be installed over battens, and some can be installed over battens or over solid decking. We are frequently asked if a metal roof should be installed on battens or direct to the roof deck.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |